Tyrannosauridae (or tyrannosaurids, meaning `tyrant lizards`) is a family of coelurosaurian theropod dinosaurs which comprises two subfamilies containing up to eleven genera, including the eponymous Tyrannosaurus. The exact number of genera is controversial, with some experts recognizing as few as three. All of these animals lived near the end o.....Found on http://en.wikipedia.org/wiki/Tyrannosauridae